Technical Specifications
INPUT CHARACTERISTICS
Input Current:
DC NMR:
1k Unbalanced
CMR:
< 100 pA.
> 60dB at 50/60Hz.
> 120dB at DC/50Hz/60Hz, DC ranges;
> 60dB at DC/50Hz/60Hz, AC ranges.
AC AMPS (True RMS)
Range
ACCURACY
Accuracies apply for 1 year 18oC to 26oC. Temperature coefficient outside
these limits is <0⋅1 x quoted range accuracy per oC. Warm-up time to rated
accuracy is 1 hour.
DC VOLTS
Range
Accuracy(±)
Res.
Input Impedance
Max Input
200mV
2V
20V
200V
1000V
0⋅017% + 3d
0⋅012% + 3d
0⋅019% + 3d
0⋅019% + 3d
0⋅019% + 3d
1µV
10µV
100µV
1mV
10mV
10MΩ or >1GΩ
(Hi Z mode)
1kV DC or
AC Peak
any range
10MΩ
Accuracy(±)
Resolution
Max. Measuring Current
Max. Input
200
2k
20k
200k
2M
20M
0⋅025% + 4d
0⋅019% + 3d
0⋅019% + 3d
0⋅019% + 3d
0⋅022% + 3d
0⋅07% + 3d
1mΩ
10mΩ
100mΩ
1Ω
10Ω
100Ω
1⋅5mA
1⋅5mA
0⋅4mA
40µA
4µA
400nA
300V DC or
RMS continuous any
Ohms input
any range
Max open circuit voltage 3⋅5V. Diode Test on 2k range.
Audible continuity check available on all ranges.
AC VOLTS (True RMS)
5kHz - 10kHz
0⋅2% + 250d
0⋅2% + 250d
0⋅2% + 250d
0⋅2% + 250d
-
Overrange:
Overflow:
Annunciators:
300mV
max
1A, 300V
fuse protected
650mV
max
10A, 300V
fuse protected
THURLBY THANDAR INSTRUMENTS
1906
10kHz-20kHz 20kHz-50kHz
3% + 500d
0⋅5% + 300d 3% + 1500d
0⋅5% + 300d 2% + 1000d
0⋅5% + 500d
-
Digital Filter:
Touch & Hold:
% DEV:
dB:
Min/Max:
Data Logger:
RS232:
DC AMPS
AC Input:
Accuracy(±)
Resol
ution
Voltage Max. Input
Burden
200µA
2mA
20mA
200mA
10A
0⋅08% + 12d
0⋅08% + 12d
0⋅08% + 12d
0⋅08% + 12d
0⋅08% + 12d
0⋅12% + 12d
1nA 300 mV 1A, 300V
max
fuse pro10nA
tected
100nA
1µA
100µA 650mV 10A, 300V
max
fused
100µA
Operates over full range; values can be stored for
every function.
10 options, including optimised default values for
each range and function.
Reading is held when stable.
Displays % deviation from entered reference value.
Displays measurement in dB relative to 1V, 1mA,
1kΩ or user entered value, or in dBm.
Linear scaling of results, with offset.
Reading displayed with H, L, or P (pass) with respect
to user-defined high and low limits.
Minimum and maximum reading stored.
Manual or automatic storage of 100 measurements,
Storage interval 1s to 9999s.
INTERFACES
GPIB (Optional):
Range
13mm LED, 8 digit.
Selectable 5½ digit or 4½ digit.
3 readings/sec (5½ digit).
10 readings/sec (4½ digit).
Displays OL if input too great for range.
Displays OFLO if calculated result overflows display.
LEDs for range, function and program modes.
COMPUTING FUNCTIONS
Null:
Additional error at crest factor=3 typically 0⋅7%. Input impedance 1MΩ /
<100 pF any range. Max input 750V rms, 1kV peak, any range.
Accuracies apply from 10% to 100% of full scale.
<2000mA
>2000mA
Max Input
Additional error at crest factor=3 typically 0⋅7%. Accuracies apply from
10% to 100% of full scale.
Ax+B:
Limits:
Accuracy(±)
45Hz - 5kHz
0⋅2% + 150d
0⋅2% + 150d
0⋅2% + 150d
0⋅2% + 150d
0⋅2% + 150d
0⋅37% + 100d
0⋅37% + 100d
0⋅37% + 100d
0⋅37% + 100d
0⋅37% + 100d
0⋅4% + 100d
Voltage
Burden
DISPLAY
Range
200mV
2V
20V
200V
750V
<2000mA
>2000mA
Display Type:
Scale Length:
Reading Rate:
RESISTANCE (OHMS)
Range
200µA
2mA
20mA
200mA
10A
Accuracy(±) 45 Hz - 1 kHz
Baud rates 300, 1200 or 9600. Complies fully with
the ARC (Addressable RS232 Chain) interface standard. Address selectable from the front panel.
Fully complies with IEEE-488.1 and IEEE-488.2
GENERAL
Consumption:
Operating Range:
Storage Range:
Environmental:
Safety:
EMC:
Size:
Weight:
220 to 240 volts ±10% or 110 to 120 volts ±10%
50/60Hz, Installation Category II.
25VA max.
+5oC to +40oC, 20% to 80% RH
-40oC to +60oC
Indoor use at <2000m, Pollution Degree 1.
Complies with EN61010-1.
Complies with EN61326.
260(W) x 88(H) x 235(D)mm, excl. handle and feet
2⋅2kg.
Thurlby Thandar Instruments Ltd. operates a policy of continuous development and reserves the right to alter specifications without prior notice.
Designed and built in Europe by:
Thurlby Thandar Instruments Ltd.
Glebe Road, Huntingdon. Cambs. PE29 7DX United Kingdom (UK)
Tel: +44 (0)1480 412451 Fax: +44 (0)1480 450409
Email: sales@tti-test.com Web: http://www.tti-test.com
82100-0047 Issue 3
5½ digit high performance multimeter
Full autoranging, True RMS, RS-232 & GPIB interfaces
built-in computing & data logging
5½ digit performance at a 4½ digit price
higher resolution, accuracy & functionality
Greater resolution and
accuracy
51/2
The 1906 is a true
digit meter with a
scale length of ± 210,000 counts.
This gives it not just superior resolution
relative to 41/2 digit meters, but much
higher effective accuracy as well.
Greater sensitivity and
higher input impedance
With a maximum resolution of 1µV, 1mΩ
and 1nA, the 1906 is ten times more sensitive than a 41/2 digit meter.
This extra sensitivity enables accurate
measurements to be made in areas previously impossible such as thermocouple
junctions, switch contact resistance or capacitor leakages.
Industry standard 10MΩ input impedance
applies to all dc voltage ranges, but the lowest two can alternatively be selected at
greater than 1000MΩ impedance to eliminate errors when measuring high impedance circuitry.
True RMS ac functions
The diagram shows how the effective accuracy varies with reading after taking
into account the fixed errors. Over a
range of voltages, the 1906 is around
four times more accurate than a typical
41/2 digit meter.
The 1906 provides True RMS ac response
which gives accurate measurements regardless of the waveform shape.
The wide bandwidth voltage attenuator
provides high accuracy within the audio
band and gives extended response to
avoid distortion when measuring switching
waveforms.
Auto or manual ranging
The 1906 offers fully automatic ranging
on all functions including current. Alternatively any range can be selected and
held manually.
4 terminal Ohms for
improved stability
Resistance measurements can be made
in either 2 terminal or 4 terminal mode.
High impedance sensing ensures that
the meter switches automatically between modes.
For low resistance measurements, 4 terminal mode offers much higher accuracy
and repeatability.
The resistance function also provides selectable audible continuity as well as diode test capabilities.
Closed case calibration
The 1906 stores its calibration constants
in permanent memory (EEPROM). Consequently it can be recalibrated without
ever opening the case.
full bus programmability
Single key convenience
functions for ease of use
Linear scaling with offset
(Ax+b)
Press the “null” key and the present displayed reading is stored and subtracted
from all future readings.
This powerful feature has a host of uses
such as removing test lead resistance,
observing deviation levels, or measuring
relative to alternative voltage points using a fixed ground lead connection.
This function enables a reading to be
multiplied by a scale factor (A) and for an
offset (b) to be added or subtracted.
This means, for example, that the electrical output of a transducer can be scaled
to give a direct readout of the physical
parameter e.g. temperature or weight.
It is particularly useful with 4-20mA current loops.
Touch and Hold
The touch and hold function is invaluable
when taking measurements in awkward
situations where it may be difficult to see
the multimeter display.
With touch and hold selected, the display
is automatically frozen every time a stable reading is achieved. A further press
of the T/HOLD key un-freezes the display.
Digital filtering for better
noise performance
The 1906 uses non-linear digital filtering
which is highly effective in eliminating
unwanted noise, but responds rapidly to
a change in the reading.
When working with very noisy or unstable measurements, the characteristics of
the digital filter can be adjusted to suit the
application.
Full protection for the
instrument and the user
The 1906 incorporates extensive protection against damage from accidental
overloads on all ranges including 10
Amps.
In addition the 1906 meets the stringent
safety requirements of IEC348 and
IEC1010-1 for measurements up to
1kV.
●
●
●
●
●
●
●
●
5 ½ digit scale length ( 210,000 counts)
0.012% basic one year accuracy
1uV, 1m and 1nA resolution, 4 terminal Ohms
Full automatic or manual ranging
True RMS ac functions, wide ac bandwidth
Full set of current ranges from 200µA to 10A
Wide range of computing and data logger functions
Fully programmable by RS-232 or GPIB interfaces
Storage of front-panel
set-ups
The 1906 can store up to six front panel
set-ups in non-volatile memory.
In addition to the range and function
each set-up defines the active computing or logging functions along with their
parameters.
This facility is particularly valuable when
similar tests need to be repeated at intervals.
Limits comparison
This function enables the reading to be
tested against high and low limits set by
the user.
The display then shows a code of H
(high), L (low) or P (pass) at the end of
the display.
Percentage deviation ( %)
This function enables the meter to display the percentage amount by which the
reading differs from a nominal value chosen by the user.
It is invaluable for measuring tolerance
or stability.
Min-Max storage
The Min-Max function stores the highest
and lowest values of a set of readings.
This facility has many uses such as
checking for power supply glitches, recording peak temperature excursions
and avoiding “missed” readings when
using the Logger function.
Logarithmic
measurements (dB)
This function allows measurements to be
displayed in the form 20log10X. Built-in
zero reference scaling enables voltages
to be displayed in dBV or dBm relative to
any required impedance.
Using the null key allows gains and
losses to be measured directly.
Automatic data logging
The 1906 can store up to 100 readings at
any required time interval from 1 reading
per second up to 1 reading every 3
hours.
A simple recall sequence allows the
readings to be scrolled onto the display
whenever required. Alternatively results
can be downloaded using the RS232 or
GPIB interfaces.
As a result, tedious time related measurement sequences can be handled
automatically without disrupting your
work.
Manual storage of readings is also available eliminating the need for paper and
pencil when making a series of measurements.
Storage can also be triggered from the
RS-232 or GPIB interfaces.
Full bus control via
RS-232 or GPIB
The 1906 is designed for complete bus
control. Every function of the instrument
can be controlled using either the RS-232
interface or the GPIB interface (optional).
The RS-232 interface, which is fitted as
standard, is compatible with the TTi ARC
system.
The ARC system (Addressable RS232
Chain) enables up to 32 instruments to
be “daisy-chained” together and to be individually addressed and controlled using a single RS232 port of a PC.
Compatible with IEEE-488.2
The GPIB interface is an option. When
installed, a rear panel switch allows the
user to choose between RS232 or GPIB
control.
The GPIB interface conforms fully with
both IEEE-488.1 and IEEE-488.2. The .2
standard contains many enhancements
which are particularly important when
programming systems incorporating a
number of instruments.
built-in computing & data logging
5½ digit performance at a 4½ digit price
higher resolution, accuracy & functionality
Greater resolution and
accuracy
51/2
The 1906 is a true
digit meter with a
scale length of ± 210,000 counts.
This gives it not just superior resolution
relative to 41/2 digit meters, but much
higher effective accuracy as well.
Greater sensitivity and
higher input impedance
With a maximum resolution of 1µV, 1mΩ
and 1nA, the 1906 is ten times more sensitive than a 41/2 digit meter.
This extra sensitivity enables accurate
measurements to be made in areas previously impossible such as thermocouple
junctions, switch contact resistance or capacitor leakages.
Industry standard 10MΩ input impedance
applies to all dc voltage ranges, but the lowest two can alternatively be selected at
greater than 1000MΩ impedance to eliminate errors when measuring high impedance circuitry.
True RMS ac functions
The diagram shows how the effective accuracy varies with reading after taking
into account the fixed errors. Over a
range of voltages, the 1906 is around
four times more accurate than a typical
41/2 digit meter.
The 1906 provides True RMS ac response
which gives accurate measurements regardless of the waveform shape.
The wide bandwidth voltage attenuator
provides high accuracy within the audio
band and gives extended response to
avoid distortion when measuring switching
waveforms.
Auto or manual ranging
The 1906 offers fully automatic ranging
on all functions including current. Alternatively any range can be selected and
held manually.
4 terminal Ohms for
improved stability
Resistance measurements can be made
in either 2 terminal or 4 terminal mode.
High impedance sensing ensures that
the meter switches automatically between modes.
For low resistance measurements, 4 terminal mode offers much higher accuracy
and repeatability.
The resistance function also provides selectable audible continuity as well as diode test capabilities.
Closed case calibration
The 1906 stores its calibration constants
in permanent memory (EEPROM). Consequently it can be recalibrated without
ever opening the case.
full bus programmability
Single key convenience
functions for ease of use
Linear scaling with offset
(Ax+b)
Press the “null” key and the present displayed reading is stored and subtracted
from all future readings.
This powerful feature has a host of uses
such as removing test lead resistance,
observing deviation levels, or measuring
relative to alternative voltage points using a fixed ground lead connection.
This function enables a reading to be
multiplied by a scale factor (A) and for an
offset (b) to be added or subtracted.
This means, for example, that the electrical output of a transducer can be scaled
to give a direct readout of the physical
parameter e.g. temperature or weight.
It is particularly useful with 4-20mA current loops.
Touch and Hold
The touch and hold function is invaluable
when taking measurements in awkward
situations where it may be difficult to see
the multimeter display.
With touch and hold selected, the display
is automatically frozen every time a stable reading is achieved. A further press
of the T/HOLD key un-freezes the display.
Digital filtering for better
noise performance
The 1906 uses non-linear digital filtering
which is highly effective in eliminating
unwanted noise, but responds rapidly to
a change in the reading.
When working with very noisy or unstable measurements, the characteristics of
the digital filter can be adjusted to suit the
application.
Full protection for the
instrument and the user
The 1906 incorporates extensive protection against damage from accidental
overloads on all ranges including 10
Amps.
In addition the 1906 meets the stringent
safety requirements of IEC348 and
IEC1010-1 for measurements up to
1kV.
●
●
●
●
●
●
●
●
5 ½ digit scale length ( 210,000 counts)
0.012% basic one year accuracy
1uV, 1m and 1nA resolution, 4 terminal Ohms
Full automatic or manual ranging
True RMS ac functions, wide ac bandwidth
Full set of current ranges from 200µA to 10A
Wide range of computing and data logger functions
Fully programmable by RS-232 or GPIB interfaces
Storage of front-panel
set-ups
The 1906 can store up to six front panel
set-ups in non-volatile memory.
In addition to the range and function
each set-up defines the active computing or logging functions along with their
parameters.
This facility is particularly valuable when
similar tests need to be repeated at intervals.
Limits comparison
This function enables the reading to be
tested against high and low limits set by
the user.
The display then shows a code of H
(high), L (low) or P (pass) at the end of
the display.
Percentage deviation ( %)
This function enables the meter to display the percentage amount by which the
reading differs from a nominal value chosen by the user.
It is invaluable for measuring tolerance
or stability.
Min-Max storage
The Min-Max function stores the highest
and lowest values of a set of readings.
This facility has many uses such as
checking for power supply glitches, recording peak temperature excursions
and avoiding “missed” readings when
using the Logger function.
Logarithmic
measurements (dB)
This function allows measurements to be
displayed in the form 20log10X. Built-in
zero reference scaling enables voltages
to be displayed in dBV or dBm relative to
any required impedance.
Using the null key allows gains and
losses to be measured directly.
Automatic data logging
The 1906 can store up to 100 readings at
any required time interval from 1 reading
per second up to 1 reading every 3
hours.
A simple recall sequence allows the
readings to be scrolled onto the display
whenever required. Alternatively results
can be downloaded using the RS232 or
GPIB interfaces.
As a result, tedious time related measurement sequences can be handled
automatically without disrupting your
work.
Manual storage of readings is also available eliminating the need for paper and
pencil when making a series of measurements.
Storage can also be triggered from the
RS-232 or GPIB interfaces.
Full bus control via
RS-232 or GPIB
The 1906 is designed for complete bus
control. Every function of the instrument
can be controlled using either the RS-232
interface or the GPIB interface (optional).
The RS-232 interface, which is fitted as
standard, is compatible with the TTi ARC
system.
The ARC system (Addressable RS232
Chain) enables up to 32 instruments to
be “daisy-chained” together and to be individually addressed and controlled using a single RS232 port of a PC.
Compatible with IEEE-488.2
The GPIB interface is an option. When
installed, a rear panel switch allows the
user to choose between RS232 or GPIB
control.
The GPIB interface conforms fully with
both IEEE-488.1 and IEEE-488.2. The .2
standard contains many enhancements
which are particularly important when
programming systems incorporating a
number of instruments.
Technical Specifications
INPUT CHARACTERISTICS
Input Current:
DC NMR:
1k Unbalanced
CMR:
< 100 pA.
> 60dB at 50/60Hz.
> 120dB at DC/50Hz/60Hz, DC ranges;
> 60dB at DC/50Hz/60Hz, AC ranges.
AC AMPS (True RMS)
Range
ACCURACY
Accuracies apply for 1 year 18oC to 26oC. Temperature coefficient outside
these limits is <0⋅1 x quoted range accuracy per oC. Warm-up time to rated
accuracy is 1 hour.
DC VOLTS
Range
Accuracy(±)
Res.
Input Impedance
Max Input
200mV
2V
20V
200V
1000V
0⋅017% + 3d
0⋅012% + 3d
0⋅019% + 3d
0⋅019% + 3d
0⋅019% + 3d
1µV
10µV
100µV
1mV
10mV
10MΩ or >1GΩ
(Hi Z mode)
1kV DC or
AC Peak
any range
10MΩ
Accuracy(±)
Resolution
Max. Measuring Current
Max. Input
200
2k
20k
200k
2M
20M
0⋅025% + 4d
0⋅019% + 3d
0⋅019% + 3d
0⋅019% + 3d
0⋅022% + 3d
0⋅07% + 3d
1mΩ
10mΩ
100mΩ
1Ω
10Ω
100Ω
1⋅5mA
1⋅5mA
0⋅4mA
40µA
4µA
400nA
300V DC or
RMS continuous any
Ohms input
any range
Max open circuit voltage 3⋅5V. Diode Test on 2k range.
Audible continuity check available on all ranges.
AC VOLTS (True RMS)
5kHz - 10kHz
0⋅2% + 250d
0⋅2% + 250d
0⋅2% + 250d
0⋅2% + 250d
-
Overrange:
Overflow:
Annunciators:
300mV
max
1A, 300V
fuse protected
650mV
max
10A, 300V
fuse protected
THURLBY THANDAR INSTRUMENTS
1906
10kHz-20kHz 20kHz-50kHz
3% + 500d
0⋅5% + 300d 3% + 1500d
0⋅5% + 300d 2% + 1000d
0⋅5% + 500d
-
Digital Filter:
Touch & Hold:
% DEV:
dB:
Min/Max:
Data Logger:
RS232:
DC AMPS
AC Input:
Accuracy(±)
Resol
ution
Voltage Max. Input
Burden
200µA
2mA
20mA
200mA
10A
0⋅08% + 12d
0⋅08% + 12d
0⋅08% + 12d
0⋅08% + 12d
0⋅08% + 12d
0⋅12% + 12d
1nA 300 mV 1A, 300V
max
fuse pro10nA
tected
100nA
1µA
100µA 650mV 10A, 300V
max
fused
100µA
Operates over full range; values can be stored for
every function.
10 options, including optimised default values for
each range and function.
Reading is held when stable.
Displays % deviation from entered reference value.
Displays measurement in dB relative to 1V, 1mA,
1kΩ or user entered value, or in dBm.
Linear scaling of results, with offset.
Reading displayed with H, L, or P (pass) with respect
to user-defined high and low limits.
Minimum and maximum reading stored.
Manual or automatic storage of 100 measurements,
Storage interval 1s to 9999s.
INTERFACES
GPIB (Optional):
Range
13mm LED, 8 digit.
Selectable 5½ digit or 4½ digit.
3 readings/sec (5½ digit).
10 readings/sec (4½ digit).
Displays OL if input too great for range.
Displays OFLO if calculated result overflows display.
LEDs for range, function and program modes.
COMPUTING FUNCTIONS
Null:
Additional error at crest factor=3 typically 0⋅7%. Input impedance 1MΩ /
<100 pF any range. Max input 750V rms, 1kV peak, any range.
Accuracies apply from 10% to 100% of full scale.
<2000mA
>2000mA
Max Input
Additional error at crest factor=3 typically 0⋅7%. Accuracies apply from
10% to 100% of full scale.
Ax+B:
Limits:
Accuracy(±)
45Hz - 5kHz
0⋅2% + 150d
0⋅2% + 150d
0⋅2% + 150d
0⋅2% + 150d
0⋅2% + 150d
0⋅37% + 100d
0⋅37% + 100d
0⋅37% + 100d
0⋅37% + 100d
0⋅37% + 100d
0⋅4% + 100d
Voltage
Burden
DISPLAY
Range
200mV
2V
20V
200V
750V
<2000mA
>2000mA
Display Type:
Scale Length:
Reading Rate:
RESISTANCE (OHMS)
Range
200µA
2mA
20mA
200mA
10A
Accuracy(±) 45 Hz - 1 kHz
Baud rates 300, 1200 or 9600. Complies fully with
the ARC (Addressable RS232 Chain) interface standard. Address selectable from the front panel.
Fully complies with IEEE-488.1 and IEEE-488.2
GENERAL
Consumption:
Operating Range:
Storage Range:
Environmental:
Safety:
EMC:
Size:
Weight:
220 to 240 volts ±10% or 110 to 120 volts ±10%
50/60Hz, Installation Category II.
25VA max.
+5oC to +40oC, 20% to 80% RH
-40oC to +60oC
Indoor use at <2000m, Pollution Degree 1.
Complies with EN61010-1.
Complies with EN61326.
260(W) x 88(H) x 235(D)mm, excl. handle and feet
2⋅2kg.
Thurlby Thandar Instruments Ltd. operates a policy of continuous development and reserves the right to alter specifications without prior notice.
Designed and built in Europe by:
Thurlby Thandar Instruments Ltd.
Glebe Road, Huntingdon. Cambs. PE29 7DX United Kingdom (UK)
Tel: +44 (0)1480 412451 Fax: +44 (0)1480 450409
Email: sales@tti-test.com Web: http://www.tti-test.com
82100-0047 Issue 3
5½ digit high performance multimeter
Full autoranging, True RMS, RS-232 & GPIB interfaces